As autumn ushers in colder weather, police, firefighters and emergency personnel deal with two seasonal issues — dangerous faulty furnaces and stolen vehicles known as “puffers” — that can typically be avoided through diligence.

This morning, Denver police responded to the 1700 block of Xavier Street when a white Jeep Cherokee, left unattended while warming up, was stolen, according to scanner traffic.

Denver firefighters, meanwhile, responded Thursday morning to a report of residents feeling ill inside a home, and the furnace was suspect. Luckily, there was no serious injury or illness, but earlier this year a Denver woman was hospitalized with carbon monoxide poisoning after starting up an older, faulty furnace.

Now that the leaves have fallen and fall is clearly in the air, Coloradans should take care not to puff vehicles, and also make sure that furnaces are serviced and working properly.